Malicious PDF — malware analysis report

Static analysis result for SHA-256 41b434e6ad12870f…

MALICIOUS

PDF

83.4 KB Created: 2021-09-12 19:10:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 665a3a2f65c0d2fcb8b3d9011c4f8f94 SHA-1: 577e433b0ce66cdc60a0879143fc7dcc59012b85 SHA-256: 41b434e6ad12870f9423a0e49580e5492028627d798920bd07f6222fa1d90440
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://mobil-tech.com/files/55185978492.pdf In PDF document text
    • http://yuqiaohome.com/uploads/files/202109062106024906.pdfIn PDF document text
    • http://sweet-sugar.de/images/uploadedimages/file/ximis.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/41453697680.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/zekawamitiputula.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/87069214417.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/30044103790.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/nudefukuseresajawez.pdfIn PDF document text
    • http://woykoff.hu/upload/file/senivelebasofupu.pdfIn PDF document text
    • http://beta-rc.com/upload/files/15051205746.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/3332886617.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/6b1e875b3aeee1bd38943a7810e05159/7742140242.pdfIn PDF document text
    • http://aeusjtu.pretty-match.com/upload/files/nisawibufeworalobifebo.pdfIn PDF document text
    • https://fasleh.net/Files/files/vatelikitavuxobuz.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b0ee8b26b---pitetodugagekug.pdfIn PDF document text
    • https://icbacademy.com/upload/files/19546210820.pdfIn PDF document text
    • http://nhakhoauytinhaiphong.com/upload/files/gobunoduzefosugaj.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210909_944DB05B57E20B13.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c5227d6cb---68623140872.pdfIn PDF document text
    • https://makenie.com/upload/files/18311497462.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364b92ebbf8---5903288979.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/zodiregesofusojoji.pdfIn PDF document text
    • http://popeyebio.com/upload/files/66941427406.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/f3d23145be57aada47a6c47c51d2f316/90539811932.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/kexiwezamidevepabujipozoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=t+mobile+cannot+receive+text+messagesPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D3 18180 bytes
SHA-256: 6058440d23f4354efa342f04d12a83e18841fb1f599ba69cbcc63c8559827f34
font_01_sfnt_off00011275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11275 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A8C 10844 bytes
SHA-256: 9431be3a05c27afc5e42e01eb1c6881fc88568f9bc1b54bbf1d71ec210c7bb44